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C/ FRUELA, NÚM. 6, PLANTA 1
28011 MADRID (ESPAÑA)
TECHNICAL REPOR T
Accident occurred on 21 May 1998 to
Aircraft Airbus A-320-212 Registration G-UKLL
At Ibiza Airport, Balearic Islands
A - 19/98
TECHNICAL REPORT
Accident occurred on 21 May 1998 to
Aircraft Airbus A-320-212 Registration G-UKLL
At Ibiza Airport, Balearic Islands.
I
-CONTENTS -
SYNOPSIS Pag. 2
1. FACTUAL INFORMATIÓN Pag. 4
1.1. History of the flight Pag. 4
1.2. Injuries to persons Pag. 7
1.3. Damage to aircraft Pag. 7
1.4. Other damage Pag. 7
1.5. Personnel information Pag. 8
1.5.1. Commander Pag. 8
1.5.2. First Officer Pag. 8
1.5.3. Cabin Crew Pag. 9
1.5.4. Flight Deck Crew Training Pag. 9
1.6. Aircraft information Pag. 10
1.6.1. Airframe Pag. 10
1.6.2. Certificate of airworthiness Pag. 10
1.6.3. Maintenance record Pag. 10
1.6.4. Engines Pag. 10
1.6.5. Braking and Anti Skid System Description Pag. 11
1.6.6. BSCU - Brake & Steering Control Unit Pag. 11
1.6.7. BSCU, internal disagreement logic Pag. 13
1.6.8. Warning and failure messages Pag. 14
1.7. Meteorological information Pag. 15
1.8. Navigation aids Pag. 15
II
1.9. Communications Pag. 16
1.10. Aerodrome information Pag. 16
1.11. Flight recorders Pag. 16
1.11.1 Digital Flight Data Recorder – DFDR Pag. 16
1.11.2. Cockpit Voice Recorder – CVR Pag. 19
1.11.3. Post Flight Report – PFR Pag. 20
1.12. Wreckage and impact information Pag. 21
1.13. Medical and pathological information Pag. 22
1.14. Fire Pag. 22
1.15. Survival Pag. 22
1.16. Tests and research Pag. 24
1.16.1. Tests with the complete aircraft Pag. 24
1.16.2. Tests on the BDDV Pag. 26
1.16.3. Preliminary actions taken by the Manufacturer Pag. 29
1.16.4. Cold soak tests Pag. 31
1.16.5. Analysis of the fluid found inside BDDV cover Pag. 32
1.16.6. BDDV history Pag. 33
1.16.7. BSCU history and tests Pag. 33
1.16.8. Brake control panel tests Pag. 34
1.16.9. Relevant aircraft history Pag. 35
1.17. Organisational and management information Pag. 36
1.18. Additional information Pag. 36
1.18.1. Subsequent actions by the Manufacturer on the BDDV Pag. 36
1.18.2. Subsequent actions by Airbus Industrie on the BSCU Pag. 37
III
1.19. Investigation techniques Pag. 38
2. ANALYSIS Pag. 40
2.1. Behaviour of the aircraft Pag. 40
2.1.1. Loss of Normal braking system Pag. 40
2.1.2. Loss of Alternate braking systemt Pag. 41
2.1.3. Detailed analysis of failures Pag. 41
2.2. Actions by the Crew Pag. 44
2.2.1. Flight Deck Crew Procedures Pag. 44
2.2.2. Evacuation of the aircraft Pag. 46
3. CONCLUSIONS Pag. 47
3.1. Findings Pag. 47
3.2. Causes Pag. 48
4. SAFETY RECOMMENDATIONS Pag. 49
5. APPENDICES Pag. 51
APPENDIX A Pag. 51
APPENDIX B Pag. 53
APPENDIX C Pag. 74
APPENDIX D Pag. 76
APPENDIX E Pag. 80
APPENDIX F Pag. 85
APPENDIX G Pag. 87
APPENDIX H Pag. 89
APPENDIX I Pag. 92
INDEX OF PHOTOGRAPHS Pag. 93
1
WARNING
This Report is a technical document that reflects the point of view of the
Comisión de Investigación de Accidentes e Incidentes de Aviación Civil (Air
Accidents and Incidents Investigation Commission) regarding the circumstances
that surrounded the event which is the subject of this research, together with its
causes and consequences.
In conformity with the provisions of Annex 13 to the International Civil
Aviation Convention and Royal Decree 389/1998 of March 13, which regulates
the research on civil aviation accidents and incidents, this research is of an
exclusively technical nature and it is not aimed at claiming or limiting rights or
personal or financial liabilities. The research was conducted without necessarily
using test procedures and with no basic aim other than preventing future accidents.
The results of this piece of research do not condition or prejudge those of any
possible punishing proceedings concerning the event that might be initiated under
the provisions of Ley de Navegación Aérea (Air Navigation Act).
2
SYNOPSIS
During the cruise phase of the flight from Manchester to Ibiza,
Autobrake Low was pre-selected for landing. Due to a computer logic channel
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